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For me the barriers have been implementing the server (especially with authorisation logic); consuming it as a client was the relatively easy part.

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In that case you may be interested in AWS AppSync (a managed GraphQL service)

https://aws.amazon.com/appsync/

Also check out Hasura (https://hasura.io) which works on any Postgres anywhere. Hasura provides out-of-the-box GraphQL APIs which you can extend as well while hooking into any (web-based) external Auth system for role based access control.

Full Disclosure: I work at Hasura.

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